Restoring Annotations via Core-Data

Currently, I have an application whe开发者_C百科re a user clicks on a map and adds annotation points with certain subtitles. However, when the phone is power-cycled, all their added points are gone. I'm interested in making these annotations persistent. I've been trying to figure out how to do this with Core-Data, but after reading this tutorial here: http://www.raywenderlich.com/934/core-data-tutorial-getting-started, I'm a bit lost on where to start.

Any help would be appreciated, thanks.

If you have a core data application set up, you will only need to create an entity in the xcdatamodel file. Add attributes for whatever you may want to store.

latitude - double
longitude - double
title - NSString

etc. until you have what you want.

When you want to add an annotation, you should create a new core data object for your entity. It will look something like this

Location *newLocation = (Location *)[NSEntityDescription insertNewObjectForEntityForName:@"Location" inManagedObjectContext:self.managedObjectContext];
Location.latitude = ....
// and so on to store the information you want in its attributes;

You can set the attributes at different point if you change the values at a later point. You just need to be able to access the right object to go with the annotation. You should be able to do this by using NSFetchRequest in your managedObjectContext. You can use NSPredicate to filter the objects to the one you want. Then when you are ready to exit the app, save your context using

NSError *error = nil;
if ([managedObjectContext save:&error]) {
    // handle the error;
}

which will store all the objects you've added to be used next time you open the app. You will then be able to create your annotations based on the objects in your managedObjectContext. I hope this is what you were looking for, or at least gives you an idea how to approach what you'd like to do.